446 



Bulletin American Museum of Natural History. [Vol. XXXV, 



bill is fairly common about the lower end of the Peninsula and the islands in 

 the lower part of the Gulf. It is reported to be more abundant about the 

 Tres Marias Islands below the mouth of the Gulf. The employees of the 

 pearl shell companies at La Paz obtain quantities of tortoise shells, but 



AttM ■- «>•«►»•*««» 



WiTiffi 



Fit;. 40. Oyster reefs at low tide. Algodones Lagoon, above mouth of Yaqui River, Gulf of 

 California. 



Fig. 41. Seal Rock near San Josef Island, Gulf of California. Showing numerous shells of green 

 turtle left on the beach by fishermen. San Josef Island in distance on the right. 



some of these are received from localities along the mainland of Mexico. 

 I obtained two very fine specimens at La Paz for museum purposes, which 

 measured along the top shell 34 inches and 31 inches respectively. Some of 

 the largest specimens obtained are roughly mounted and polished for exbibi- 

 tion purposes. 



